Apparently, they had needed a big spat to start a rapprochement, which was hastened by ongoing criticism within each camp of its own tenets. Within ethology, the younger generation grumbled about the rigid Lorenzian drive and instinct concepts, whereas comparative psychology had an even longer tradition of challenges to its own dominant paradigm.42 Cognitive approaches had been tried off and on, even as early as the 1930s.43 But ironically, the biggest blow to behaviorism came from within. It all started with a simple learning experiment conducted on rats. Anyone who has tried to punish a dog
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